Comparison of sizes between various IR observation methods is shown above. The plot compares IR sizes (y-axis) from mock photometry (50 μm) and ALMA simulations (high-resolution, ≈0.01 − 0.02′′ at 156 μm) with intrinsic sizes (50 μm) (x-axis). The hex-bin plot shows the log mapped distribution of photometric sizes whereas the contours show the log mapped distribution of mock ALMA sizes. The black line shows the 1:1 relation with the yellow line showing the best-fit y = mx relation. All ALMA sizes in this plot of high angular resolution (≈0.01′′ angular resolution).